Temperature-dependent rate coefficient measurements for the reaction of bromine atoms with a series of aldehydes

Ramacher, B.; Tyndall, Geoffrey S.

doi:10.1002/1097-4601(2000)32:8<460::aid-kin2>3.0.co;2-p

Cited by 17 publications

(18 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The slower reaction of Cl [18] and Br [32] with glyoxal compared with HCHO may point to a slightly stronger C-H bond in glyoxal relative to other aldehydes, thus making reaction (5) slightly more exothermic. Nonetheless, the existence of a small but significant barrier (7 -8 kcal/ mole) to a slightly exothermic reaction, such as reaction (5), seems reasonable.…”

Section: Resultsmentioning

confidence: 99%

The atmospheric chemistry of the HC(O)CO radical

Tyndall

2001

Int. J. Chem. Kinet.

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 99%

The atmospheric chemistry of the HC(O)CO radical

Tyndall

2001

Int. J. Chem. Kinet.

View full text Add to dashboard Cite

“…Rate coefficient measurements were made using standard relative rate techniques [e.g., 28,31,44] at temperatures ranging from 228 to 298 K. Mixtures of Br 2 (2 -10 ϫ 10 15 molecule cm Ϫ3 ), the unsaturated species under study and the reference compound (both typically 1.5 -10 ϫ 10 14 molecule cm Ϫ3 ) were photolyzed in mixtures of O 2 (150 Ϯ 5 Torr) and N 2 (550 Ϯ 10 Torr) at a total pressure of 700 -710 Torr. The rate of disappearance of the unsaturated species under study (UNSAT) relative to the reference compound (REF) was monitored spectroscopically, and rate coefficient ratios, k UNSAT /k REF , were determined as follows:…”

Section: Methodsmentioning

confidence: 99%

Temperature-dependent rate coefficient measurements for the reaction of bromine atoms with trichloroethene, ethene, acetylene, and tetrachloroethene in air

Ramacher

Tyndall

2001

Int. J. Chem. Kinet.

View full text Add to dashboard Cite

“…The reaction of aldehydes with halogens (Wallington et al, 1989;Ramacher et al, 2000) is dominated by the abstraction of the relatively weakly bonded hydrogen of the aldehyde. A subsequent addition of oxygen (according to Reaction R1c) will cause a one-carbon shorter aldehyde and the release of CO 2 (Ramacher et al, 2000).…”

Section: Related Mechanisms Of Halogen Chemistrymentioning

confidence: 99%

“…A subsequent addition of oxygen (according to Reaction R1c) will cause a one-carbon shorter aldehyde and the release of CO 2 (Ramacher et al, 2000). The remaining carbonyl can be separated from the organic molecule (CO release) or be oxidized to a carboxylic acid.…”

Section: Related Mechanisms Of Halogen Chemistrymentioning

confidence: 99%

Halogenation processes of secondary organic aerosol and implications on halogen release mechanisms

et al. 2012

View full text Add to dashboard Cite

Abstract. Reactive halogen species (RHS), such as X·, X 2 and HOX containing X = chlorine and/or bromine, are released by various sources like photo-activated sea-salt aerosol or from salt pans, and salt lakes. Despite many studies of RHS reactions, the potential of RHS reacting with secondary organic aerosol (SOA) and organic aerosol derived from biomass-burning (BBOA) has been neglected. Such reactions can constitute sources of gaseous organohalogen compounds or halogenated organic matter in the tropospheric boundary layer and can influence physicochemical properties of atmospheric aerosols.Model SOA from α-pinene, catechol, and guaiacol was used to study heterogeneous interactions with RHS. Particles were exposed to molecular chlorine and bromine in an aerosol smog-chamber in the presence of UV/VIS irradiation and to RHS, released from simulated natural halogen sources like salt pans. Subsequently, the aerosol was characterized in detail using a variety of physicochemical and spectroscopic methods. Fundamental features were correlated with heterogeneous halogenation, which results in new functional groups (FTIR spectroscopy), changes UV/VIS absorption, chemical composition (ultrahigh resolution mass spectroscopy (ICR-FT/MS)), or aerosol size distribution. However, the halogen release mechanisms were also found to be affected by the presence of organic aerosol. Those interaction processes, changing chemical and physical properties of the aerosol are likely to influence e.g. the ability of the aerosol to act as cloud condensation nuclei, its potential to adsorb other gases with low-volatility, or its contribution to radiative forcing and ultimately the Earth's radiation balance.

show abstract

Temperature-dependent rate coefficient measurements for the reaction of bromine atoms with a series of aldehydes

Cited by 17 publications

References 23 publications

The atmospheric chemistry of the HC(O)CO radical

The atmospheric chemistry of the HC(O)CO radical

Temperature-dependent rate coefficient measurements for the reaction of bromine atoms with trichloroethene, ethene, acetylene, and tetrachloroethene in air

Halogenation processes of secondary organic aerosol and implications on halogen release mechanisms

Contact Info

Product

Resources

About